Higher-order Laguerre-Gauss interferometry for gravitational-wave detectors with in situ mirror defects compensation

被引：19
作者：
Allocca, A. [1 ,2 ]
Gatto, A. [3 ]
Tacca, M. [3 ]
Day, R. A. [4 ]
Barsuglia, M. [3 ]
Pillant, G. [4 ]
Buy, C. [3 ]
Vajente, G. [5 ]
机构：
[1] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[2] Univ Siena, I-53100 Siena, Italy
[3] Univ Paris Diderot, Sorbonne Paris Cite, Observ Paris, APC,CNRS,IN2P3,CEA,Irfu, F-75205 Paris 13, France
[4] EGO, I-56021 Pisa, Italy
[5] CALTECH, Pasadena, CA 91125 USA
来源：
PHYSICAL REVIEW D | 2015年 / 92卷 / 10期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevD.92.102002
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The use of higher-order Laguerre-Gauss modes has been proposed to decrease the influence of thermal noise in future generation gravitational-wave interferometric detectors. The main obstacle for their implementation is the degeneracy of modes with same order, which highly increases the requirements on the mirror defects, beyond the state-of-the-art polishing and coating techniques. In order to increase the mirror surface quality, it is also possible to act in situ, using a thermal source, sent on the mirrors after a proper shaping. In this paper we present the results obtained on a tabletop Fabry-Perot Michelson interferometer illuminated with a LG(3,3) mode. We show how an incoherent light source can reduce the astigmatism of one of the mirrors, increasing the quality of the beam in one of the Fabry-Perot cavities and then the contrast of the interferometer. The system has the potential to reduce more complex defects and also to be used in future gravitational-wave detectors using conventional Gaussian beams.
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页数：9
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